what is obsidian
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when lava is cooled down, you get a strange alkali material called obsidian.
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Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth.
Category: Volcanic glass
Other characteristics: Texture: Smooth; glassy
Fracture: Conchoidal
Specific gravity: c. 2.4
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